The group of ‘No. 1 Traveller’ lounges have teamed up with Travelzoo to offer lounge passes for £20 each.
Whilst I’ve never yet had the chance to visit one, the ‘No 1’ lounges have a good reputation and are substantially above the quality of the usual third party airport lounge. Take a look at their website. Current locations are Gatwick North, Gatwick South, Heathrow Terminal 3, Stansted (x2) and Birmingham. The Heathrow T3 lounge is pictured below.
With this promo, you can pre-buy a lounge pass for £20. The price includes a glass of champagne and the usual buffet, beer, wine and spirits. Given the wide range of free food (hot and cold) plus free drinks (except champagne), wi-fi and the high standard of decor, it looks like a decent deal if you will have a couple of hours to kill and do not otherwise have lounge access. (You can also access No 1 Traveller lounges, for free, with a Priority Pass card if you have one of those.)
The link to the Travelzoo promotion is here. The offer is valid until 19th April and the passes can be used until 28th September.